What information does it provide?

Spirometry measures air volumes and flows during breathing manoeuvres performed under precise instructions. It may form part of health surveillance when indicated by risk and the applicable protocol. It does not alone detect every respiratory disease or automatically identify the agent responsible for an abnormality.

Quality comes before interpretation

The test depends on equipment, preparation and performance of manoeuvres. Coughing, leaks, insufficient effort or inappropriate termination may affect results. The professional must review curves and acceptability rather than simply copy automatic interpretation. A device-generated number does not guarantee that measurement is valid for decision-making.

Results in context

Interpretation considers history, symptoms, appropriate references and occupational exposure. An abnormality requires clinical assessment, and a result within the expected range does not exclude every problem. Conditions that may temporarily affect the test are also reviewed. Fitness or follow-up decisions must not derive from one percentage without complete professional assessment.

Follow-up over time

Serial measurements can help identify changes but need comparability. Curves, values and quality data are retained alongside equipment and condition identification. Method changes or repeated errors can simulate progression. Quality review distinguishes variation needing investigation from a technical problem that must be resolved before interpretation.

Review example

In a hypothetical example, a person has a lower value than previously recorded. Before attributing it to exposure, the healthcare team checks manoeuvres, history and circumstances of both tests. Where appropriate, testing is repeated or extended. In parallel, prevention staff maintain respiratory risk controls; waiting for a clinical conclusion does not justify poorly controlled exposure.

Information and confidentiality

The person receives an understandable explanation of results and recommended follow-up. Clinical data remain under healthcare access with appropriate protection. The employer receives the relevant preventive conclusions without making respiratory history freely accessible. The cited guidance informs technical quality and must be complemented by current clinical criteria.